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Although many cases of autism may be characterized by increased excitation, there are also disorders with autistic features, such as Rett syndrome, a disease caused by loss of function mutations in the MeCP2 gene, in which the inhibition may dominate.

Understanding autism : from basic neuroscience to treatment (Book, ) [kudemijimtheo.ga]

In addition, these mice show increased expression of the Dlx5 transcription factor Horike et al. The Dlx gene family has a central role in regulating the development and function of forebrain inhibitory neurons Panganiban and Rubenstein, ; Cobos et al.


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Recently, five nonsynonymous Dlx2 and Dlx5 mutations have been identified in autistic probands Hamilton et al. Although it is premature to conclude that there is a causal link that connects MeCP2, the Dlx genes, and autism, this line of investigation illustrates one current approach that is aimed at elucidating the molecular and cellular basis for some forms of autism. Given that two of the hallmarks of autism are a deficit in social cognition and pronounced fear and anxiety, it is important to scrutinize the function of limbic forebrain structures including the amygdala and hypothalamus.

Fear conditioning as a model system for studying emotional learning and memory, and elucidation of the neural circuitry for fear learning, may inform studies of autism LaBar and LeDoux, Likewise, it is important to explore the role of specific nuclei and subnuclei in the amygdala on component processes of social behavior Zirlinger and Anderson, ; Schumann et al. Cerebellar connections with the limbic system and with the cerebral cortex have been posited as mediating abnormal activity that underlies the motor and sensory abnormalities, language difficulties, socioemotional difficulties, and disordered cognitive processing.

Cerebellar pathology could lead to abnormal activity in cerebello-limbic and cerebello-thalamo-cortical pathways, which in turn could be expressed as autistic behavior Dum and Strick, Autism is associated with a particular profile of impaired and spared language abilities, as well as nonverbal social deficits.

It has been argued Walenski et al.

Breakthrough Near in Treating Autism

Future directions include innovative paradigms to examine integrative explanatory theories that attempt to account for these deficits in the broader context of brain and behavior in autism. Given that cognition, social interaction, sensory function, emotional behavior, and language are disrupted in autism, and given that these functions depend on integrative mechanisms within the prefrontal cortex, it is logical to postulate that there are abnormalities in the structure and function of this brain region Price, An avenue for future inquiry is the investigation of how clinical expression depends on the interaction with neural systems in the prefrontal cortex, even if primary deficits in autism are in other brain regions.

Another potentially exciting avenue for research is to investigate possible changes in the neuronal circuitry of the thalamus and neuromodulatory systems arising in the brainstem core, basal forebrain, and posterior hypothalamus, which act on glutamatergic thalamocortical neurons, GABAergic thalamic reticular neurons, and local-circuit GABAergic interneurons, as well as functional dysfunction implicating attention and sensory gating Steriade, Future studies will require the critical integration of findings from basic neuroscience paradigms with those from genetic studies.

This may provide insights on the nature of risk genes and the timing of their expression during development, thereby providing useful clues to relevant environmental factors. Based on observations made in fragile X, and several other lines of evidence, researchers are currently exploring the possibility that alterations in synapse development and signaling may underlie some forms of autism Rubenstein and Merzenich, ; Levitt et al. This perspective has been bolstered by the identification of function-altering mutations in some neuroligin genes in a small subset of autistic people.

Studies of synaptic plasticity in the hippocampus of the Fmr1 knock-out mouse suggested a connection between metabotropic glutamate receptor mGluR signaling and the fragile X clinical phenotype Huber et al. Increased translation of group 1 mGluRs in dendrites, which would lead to overactive signaling by these receptors, may contribute to slowed altered synaptic function and other symptoms of fragile X. Drugs that target mammalian mGluR signaling rescue in flies behavioral and other deficits that are analogous to human fragile X symptoms McBride et al.

Such compounds have therapeutic potential for fragile X children, many of whom have autistic features Bear, This raises the intriguing possibility that new therapeutics developed to treat fragile X also may have efficacy in treating aspects of autism Moldin, Increased funding for cancer research resulted in an avalanche of data that greatly accelerated our understanding of its underlying mechanisms and established a foundation for current discoveries in cancer biology.

Foundations of knowledge are now in place to warrant an increased investment in autism research.

Autism Spectrum Disorder and Schizophrenia: Shared Traits and Treatment

We anticipate that in the next 10 years the result will be a marked improvement in the understanding and treatment of this devastating disorder. Moldin et al. DiCicco-Bloom and colleagues summarize their presentations at the Neurobiology of Disease workshop at the Annual Meeting of the Society for Neuroscience. Europe PMC requires Javascript to function effectively. Recent Activity. The snippet could not be located in the article text. This may be because the snippet appears in a figure legend, contains special characters or spans different sections of the article.

Getting started on the basic neuroscience of autism

J Neurosci. PMID: Steven O. Moldin , 1 John L. Rubenstein , 2 and Steven E. Hyman 3. Moldin Find articles by Steven O. John L. Rubenstein Find articles by John L.

Steven E. Hyman Find articles by Steven E. Author information Article notes Copyright and License information Disclaimer. Correspondence should be addressed to Dr. Email: ude. Keywords: amygdala, autism, cerebellum, neurodevelopment, genetics, mGluR. Getting started on the basic neuroscience of autism A satisfactory understanding of autism will require advanced knowledge of brain structure and function at multiple levels of analysis.

Candidate neural systems, circuits, and pathways We are at a critical period in autism research. Shared pathophysiology in autism, fragile X syndrome, and Rett syndrome? An SNP map of the human genome generated by reduced representation shotgun sequencing. Nature — Autism: towards an integration of clinical, genetic, neuropsychological, and neurobiological perspectives.

J Child Psychol Psychiatry 37 — Autism: a window onto the development of the social and the analytic brain. Annu Rev Neurosci 28 — Neuroanatomic observations of the brain in autism: a review and future directions. Int J Dev Neurosci 23 — Therapeutic implications of the mGluR theory of fragile X mental retardation. Genes Brain Behav 4 — The mGluR theory of fragile X mental retardation. Trends Neurosci 27 — Facial affect recognition training in autism: can we animate the fusiform gyrus? Behav Neurosci — Control of excitatory and inhibitory synapse formation by neuroligins.

Science — Dissection of synapse induction by neuroligins: effect of a neuroligin mutation associated with autism. J Biol Chem — Determinants of the success of whole-genome association testing. Genome Res 15 — Synaptogenesis: a balancing act between excitation and inhibition. Curr Biol 15 :R—R Mice lacking Dlx1 show subtype-specific loss of interneurons, reduced inhibition and epilepsy.

Nat Neurosci 8 — Brain overgrowth in autism during a critical time in development: implications for frontal pyramidal neuron and interneuron development and connectivity. Autism at the beginning: microstructural and growth abnormalities underlying the cognitive and behavioral phenotype of autism. Dev Psychopathol 17 — Reduced cortical activity due to a shift in the balance between excitation and inhibition in a mouse model of Rett syndrome. Understanding emotions in others: mirror neuron dysfunction in children with autism spectrum disorders.

Nat Neurosci 9 — Neurocognitive and electrophysiological evidence of altered face processing in parents of children with autism: implications for a model of abnormal development of social brain circuitry in autism. Cerebellar networks and autism: an anatomical hypothesis. In: Understanding autism: from basic neuroscience to treatment. Fombonne E Past and future perspectives on autism epidemiology. Gillberg C, Billstedt E Autism and Asperger syndrome: coexistence with other clinical disorders. Acta Psychiatr Scand — Neurexins induce differentiation of GABA and glutamate postsynaptic specializations via neuroligins.

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